20569601 has 8 divisors (see below), whose sum is σ = 22201704. Its totient is φ = 18944640.

The previous prime is 20569589. The next prime is 20569621. The reversal of 20569601 is 10696502.

It can be written as a sum of positive squares in 4 ways, for example, as 1560001 + 19009600 = 1249^2 + 4360^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20569601 - 2⁶ = 20569537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20569621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5255 + ... + 8291.

It is an arithmetic number, because the mean of its divisors is an integer number (2775213).

Almost surely, 2^20569601 is an apocalyptic number.

It is an amenable number.

20569601 is a deficient number, since it is larger than the sum of its proper divisors (1632103).

20569601 is a wasteful number, since it uses less digits than its factorization.

20569601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 20569601 is about 4535.3722008232. The cubic root of 20569601 is about 273.9945698393.

The spelling of 20569601 in words is "twenty million, five hundred sixty-nine thousand, six hundred one".